A vortex-induced vibration (VIV) suppression device comprising: a fairing comprising a fairing body dimensioned to partially encircle an underlying tubular and a first arm and a second arm extending from the fairing body, the fairing body comprises a first section and a second section that each have first ends that are interfacing one another to form a gap in between and a second end, and the first arm and the second arm are attached to the second ends such that they extend radially outward from the underlying tubular, and the first arm and the second arm are spaced a distance from one another; and an interior block member to facilitate an opening or a closing of the fairing body around an underlying tubular, the interior block member having a first block section and a second block section movably coupled to one another.

A vortex-induced vibration (VIV) suppression device including a body portion dimensioned to encircle an underlying tubular and a tail portion extending laterally outward from the body portion, the tail portion having a top end and a bottom end. The device further including an engaging member positioned at least at the top end or the bottom end of the body portion or the tail portion. The engaging member may be dimensioned to engage with an adjacent VIV suppression device.

A generally cylindrical element 10 that is adapted for immersion in water is described. The generally cylindrical element 10 has an outer surface 11 that is in contact with the water in use. The outer surface 11 has at least two rows of repeating shapes 20, for example hexagons 20, provided on the surface 11, where each row of repeating shapes 20 is separated from the other or the adjacent row(s) by a groove arrangement 30. Each shape 20 within a row is separated from the, or each, adjacent shape 20 by at least one groove 30. This configuration of the surface 11 reduces Vortex Induced Vibration (VIV) and/or drag that may act upon the generally cylindrical element 10 when it is immersed in a body of water.

A fairing device and method for the reduction of vortex-induced vibrations or motions, the minimization of drag about a substantially cylindrical element immersed in a fluid medium, comprising; a fairing rotatably mounted about the cylindrical element, the fairing comprising a shell with a mainly cylindrical cross-sectional shape with an outer diameter (D) following the outer diameter of the cylindrical element from an upward stagnation point of 0 degrees to at least +/90 degrees, and which at +/90 degrees continues as two fin-like portions in an aft direction, further comprising that the fin-like portions are convexly curved aft of +/90 degrees thus tapering towards each other and defining a tail end opening or gap less than the fairing standoff height. A method for mounting, storage, and deployment of the fairing device is also disclosed.

A vortex induced vibration suppression system including a buoyancy module dimensioned to at least partially encircle an underlying tubular, the buoyancy module having an exterior surface and a groove formed inwardly from the exterior surface; and a collar dimensioned to at least partially encircle the underlying tubular, the collar having a web, a set of flanges extending from the web, and at least one engaging member dimensioned to engage with the buoyancy module, when the collar is positioned around the underlying tubular.

A generally cylindrical element adapted for immersion in a fluid medium, the cylindrical element comprising an elongate body having a length and a generally circular cross-section, and a plurality of raised body portions disposed about and extending along the length of the elongate body, the raised body portions being arranged generally parallel to a longitudinal axis of the body and having a height between 2% and 10% of a diameter of the body. The plurality of raised body portions are adapted to reduce vortex-induced vibration and/or drag on the cylindrical element when the cylindrical element is immersed in the fluid medium and there is relative movement between the cylindrical element and the fluid medium.

By mutually interconnected specimens of a suppression element (100) according to the invention, there can be formed a strong and reliable construction of a tube around a tubular element. The suppression element (100) has a first fin structure (141) which is extending helically along a portion (121) of a first longitudinal edge (121, 131, 131 A, 131B), and a second fin structure (142) which is extending helically along a portion (122) of an opposite second longitudinal edge (122, 132, 132 A, 132B). In said tube, first fin structures and second fin structures of the various suppression elements are lying helically in-line relative to one another for effectively reducing vortex induced vibrations. The suppression elements (100, 200, 300, 400) are compactly stackable relative to one another.

A vortex-induced vibration (VIV) suppression system including a strake having a cylindrical body portion dimensioned to encircle an underlying tubular and having opposing ends that form at least one gap extending from a top end to a bottom end of the body portion, a fin portion extending radially outward from the body portion and helically positioned around the body portion, and a connecting member dimensioned to secure the opposing ends of the body portion in a fixed position with respect to one another; and a collar dimensioned to encircle the underlying tubular and position the strake at a fixed axial location along the underlying tubular.

Embodiments disclosed herein describe cylindrical structures with indents configured to reduce vortex induced vibrations (VIV). For example, the cylindrical structures may be configured to reduce VIV for risers subject to ocean currents.

A fairing for suppressing a vortex induced vibration (VIV) of a tubular including an encircling member dimensioned to encircle a tubular, the encircling member having a first side that extends toward a second side when the encircling member is positioned around a tubular. The fairing further including a support member positioned between the first side and the second side, the support member having a channel formed therein, and an opening to the channel is positioned between the first side and the second side. In addition, the fairing includes a tail member positioned within the channel, the tail member having a substantially planar surface that extends radially outward from the channel.